Here is a step-by-step example on how to configure Thunderbird with your mail server:
link
Hotmail and Yahoo do not offer POP access (what is needed for Thunderbird) unless you pay for their premium accounts. Gmail does, with full instructions here:
gmail help
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Main Rig: | 2nd Rig:
Windows XP/Vista | Ubuntu 8.04
ASUS P5QL-E | Gigabyte K8 Triton
Intel E8400 | Sempron 3300+
XFX 7600GT PCIe | Nvidia Gforce4 AGP
500 GB WD SATA | 160 GB WD SATA
160 GB WD SATA | 40 GB Hitachi
2 GB PC6400 | 512 MB PC2100
19" Samsung LCD | 17" Compaq 7500
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